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Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 41,831
If I have 2 electrical adapters for a specific device, which has the following information on them: 1-...
Jan7-08 08:40 AM
Shooting Star
6 2,060
We have bees flying in a jar, not touching it. Jar is closed and air in it has standard atmospheric pressure. Here is...
Jan6-08 05:35 PM
russ_watters
43 23,329
consider a symmetrical solid body. we say its centre of mass is at its geometric centre. that is, for uniform density...
Jan6-08 12:29 PM
arildno
1 12,004
The General Information about the game: The law of the Football game says that the ball should be a sphere of leather...
Jan6-08 11:11 AM
vidhatanand
0 6,385
Hi Newbie here so please go easy on me..! To keep this within my ability to understand can we please live in the...
Jan6-08 09:45 AM
44HP
6 1,881
Hi, I am having two doubts about the fringing field capacitance. 1) In most of the formulae, the fringing...
Jan6-08 03:55 AM
Dekar
0 11,128
I've unsuccessfully been looking for a decent proof of Chasles' Theorem which states that any rigid body displacement...
Jan5-08 09:51 PM
EFuzzy
4 6,484
Hello I've been reading optics (both the cartesian and real/virtual sign convention) and I have some queries: 1....
Jan5-08 03:02 AM
zimrock
14 3,284
Can anyone tell me how to i can calculate the amount of load an electromagnet will pull. the electro magnet has 3...
Jan5-08 12:56 AM
amit_sarda
3 1,462
There was an interesting problem that appeared in POPTOR 2005: A generator consists of a parallel-plate capacitor...
Jan3-08 07:38 PM
Troels
3 3,965
I heard that one can solve 2D problem with conformal mapping of complex numbers. Is it possible to use this method...
Jan3-08 03:22 PM
marcusl
3 3,647
Hi, the physics department at my (undergrad) college is looking around for a good Thermodynamics book for next...
Jan3-08 01:22 PM
mbrmbrg
1 3,163
I've only just completed high school, but I have a decent grasp on basic undergrad maths/physics. After hours and...
Jan3-08 01:57 AM
Shooting Star
28 3,112
Is there any physical law that prohibits the continuous generation of a reactionless torque using a series of...
Jan2-08 04:33 PM
russ_watters
1 3,288
what exactly is the cut-off ratio, in physical terms?
Jan2-08 03:57 PM
brewnog
2 3,790
I searched for this and get conflicting results. I have setup a demonstration that has a erlymeyer flask with a one...
Jan2-08 01:11 PM
paul k
10 3,335
I have a simple question about work. Work is force times distance, in the direction that the force is applied. So...
Dec31-07 08:47 PM
Robert100
10 7,061
Why is the above notation used instead of Sum_x Exp(-b H(x))? Does the "Tr" notation above have anything in common...
Dec31-07 04:37 PM
YaroslavVB
12 3,286
can anyone proove "kelvin plank" statement of second law of thermodynamics or atleast show that it is always followed...
Dec31-07 07:47 AM
sadhu
4 3,182
Hi all, I'm posting here because I see an apparent paradox between what intuition and equations tell me. I'm sure...
Dec31-07 02:11 AM
animalcroc
7 2,407
Hello, I was recently browsing through on of my physics books, and I came upon the following statement: "Newton was...
Dec30-07 06:19 PM
Integral
2 1,850
So.. we've got a 2D crystal, corresponding an infinite square net with +-e0 charges in each one (see the atached...
Dec30-07 04:40 AM
Istvan
2 3,183
why is there a factor of -1/4 in front of the two tensors? Is it formulated that way for convenience?
Dec29-07 11:29 PM
Parlyne
1 3,759
According to Noether's Theorem, for every symmetry of the Lagrangian there is a corresponding conservation law. For...
Dec28-07 10:58 PM
Rainbow Child
1 1,880
Can anyone tell me where the 4*pi comes from in coulomb's law? I know the law is often compared to netwon's law of...
Dec28-07 07:04 PM
rbj
7 8,869
Hi I need to prove Maxwell's second equation \nabla\bulletB=0 I tried few things, but never came with result... and...
Dec28-07 06:23 PM
ZapperZ
14 3,406
a problem.....pls check.. imagine theres a horizontal planeA bove which the effects of gravity are not felt. any...
Dec27-07 01:19 PM
Himanshu
50 8,719
Hi folks, I have a problem that I am trying to figure out that I hope you can help me with. I don't want to be spoon...
Dec26-07 10:28 PM
shiftless
4 1,700
Hello, is it possible to figure out how much force in newtons is created when a compressed gas expands?
Dec26-07 03:55 PM
russ_watters
6 7,003
we know that during inelastic collision momentum remain conserved but kinetic energy of system does not some part of ...
Dec26-07 03:19 PM
Shooting Star
12 2,360
do gravitational field lines always need to be straight, cant they be just curves if yes then please tell an...
Dec26-07 12:56 PM
sadhu
2 1,607
What does the term "Action" means in physics?
Dec26-07 12:04 PM
belliott4488
9 1,888
how does a transformer work?
Dec26-07 01:00 AM
rbj
5 3,807
Does anyone know of an experiment that shows that the electrostatic and/or magnetostatic forces have a finite speed,...
Dec26-07 12:46 AM
rbj
2 1,696
When they say K=1/2mv^2 does K mean the change of kinetic energy? because Wtotal= the change of kinetic energy...
Dec25-07 10:59 PM
sadhu
2 1,735
hello all, i've been researching a bit of info on lens optics (image propagation mostly), but have only found...
Dec25-07 08:27 PM
infamous_Q
0 1,912
Hi all, I was giving a class on dilatation and I have proposed to the students a problem where two pieces of wire...
Dec25-07 06:16 PM
DaTario
30 3,425
-------------------------------------------------------------------------------- is it true that when the net force...
Dec25-07 01:54 PM
Shooting Star
2 1,781
I want to find a solid argument why entropy always increases and even more important why it is S=\sum_i p_i \ln p_i...
Dec25-07 08:09 AM
Gerenuk
0 1,773
The Ampere's Law is \nabla \times B = \mu J and Gauss's Law is \nabla \cdot E = \frac{1}{\epsilon} \rho Since J...
Dec24-07 06:17 PM
G01
5 2,168

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